Rail fastening device



July 21, 1931. 'y K, VOSSLQH ,815,815

RAIL FASTENING DEVICE Filed Aug. 1, 1930 Patented July 21, 1931 PATENT o1-"F1615:

KARL VOSSLOH, F WERDOHL, GERMANY RAIL rAsTENmG nnvicE Application filed .August 1, 1930, Serial No. 472,427, and in Germany July 7, 1928.

Patent applications have been filed in the following foreign States: 'l

Germany, Serial V. 24,109/19, led uly 7, 1928, (not yet granted); Rumania, Ser1al N o. 5 18,602, iled June 23, 1930; France, Serial No. 297,770, filed June 26, 1930; Belgium, Serial No. 292,108, led June 24, 1930; Czechoslovakia, Serial No. P. 4977/30, led June 24, 1930; Hungary, Serial No. 11,410, filed June 1 l27, 1930; Great Britain, Serial No. 20,168/30, filed July '3, 1930; Poland, Serial No. n P. 31,373, filed June 30, 1930; Union of Sociall ist Soviet Republics, Serial No. 72,502, filed June 28, 1930 Netherlands Serial No. 52,323, i' filed J une 26,1930; Spain, Serial No. 118,760, filed June 27, 1930; Italy, filedv June 30, 1930; Austria, filed June 20, 1930. The in vention relates to rail fastening devices and more particularly to a resilient teni sioning arrangement 'for rail fastening Adevices.

Rails are usually secured by fastening the base of the rail on to the base plate screwed on to the sleepers, by means of clamping' plates. The clamping plates thereby vrest on screw pins and one end is forced against the base platey and the other agamst the base of the-"rail by means of female screws. In order to prevent the screws from becoming loose,

resilient .tensioning means are provided either between the clamping plate and` the' female screwo'r between the clamping plate and the base of the rail.

In the present invention a new construcv tion of resilient'tensioning means is arranged between the basefof the .railand the 'clamping' plates securing the rails. Thel sprlng, `a'cf. cording to the invention, is characterized' 1111 that its endsproject under the clamping plate in the direction ofthe rails, and the projecting ends are Aprovided with-a suitable bend. The tensioningA means canfvfor `eliample be so constructed according to the in` vention that it consists 'ofa spring rod, thefof the spring in the tensioning means is fairly part of which lying under the clamping plate is bent to form a relatively flat bend whilst the ends of the spring rod projecting on both .sides of the clamping plate in the direction of .the rail have more pronounced bends which are directed either opposite to or in the same direction as the bend of the part of the spring lying under the lclampin plate.

The bends at the projecting ends of the spring give an additional spring force to the v vention is especially' suitable fora railway superstructure in whichl a wooden interfl mediate layer whichl is considerably compressed isfarranged in known manner between the .rail and its supporting plate. Whilst otherwise the rail easily becomes loose through the wearing of the wooden intermediate layer and the securing means which Venablesthe material to be strained as if by knockingas a result of the alternate loadingy `and unloading of the rail by the wheel pressure, 'the v tensioning means of the present 75 invention guarantees a permanently high tensioning force which is not even slackened inany noteworthy degree with the increasedv wear ofthe securing parts because the path long( One formof construction of the invention consists in 'that the clamping. plate. is provided on its lower side with one or two bars 85 which form stops for the longitudinal sides ofgthe spring,'for the purpose of makingl the v securing device proof against becoming' loose if the tensioning means happens to be broken.

"The invention is more particularlyA dev scribed vwith reference to the accompanying drawings in which Figure 1 is a cross-section through a rail securing device and with the tensioning s means of the present invention mounted in position.

Figure 2 is a side view of the rail securing device shown in Fig. 1 on the line II--IL Figures 3 and 4 are diagrammatical illustrations of the tensioning means shown in Figs. 1 and 2 when in unloaded and tensioned condition respectively.

Figures 5 and 6 are side elevations of a modilied form of construction ofthe resilient tensioning means also in unloaded and tensioned v position respectively.

Figures 7, 8 and 9 are side elevations of a spring rod when unloaded, half tensioned, and completely tensioned, respectively and wherein the bends of the spring ends projecting over the clamping plate are in the opposite direction to the bend of the part of the spring lying under the clamping plate.

A base plate 3 is secured to a wooden sleeper 1 by means of screws 2 bolts or the like. With the intermediate insertion of a wooden plate 5 a base portion 8 of the rail 4 rests on the base plate 3. Therail is secured in position in known manner with the aid of 3o clamping plates V7 which abut on one side against the base plate 3 and on the other side against the base 8 of the rail through the.

intermediary of a resilient tensioning means l"16. The clamping plate 7 is adjustable by 86 means of a tightening nut 11 which rotates about the axis of a screw pin 10 the head of which is disposed between rib-shaped stops 6 on the base plate 3.

The resilient tensioning means arranged between the clamping plate 7 and the base 8 of the rail consists in the construction shown by way of example in Figs. 1 to 4 of a spring rod 16 the centre part of which lying under the clamping plate is bent substantially flat whilst thespring ends projecting over the clamping plate have bends and are constructed as rolled annular springs 17. l

As is shown in Fig. 1 radii a and respectively illustrate the distance between the point of engagement of the resilient tensioning means 16 with the clamping plate 7 and the forward edge of the latter and the distance between such edge Yand the point of engagement of the nut 11 on the screw bolt 10. As the former is considerably longer than the latter a considerable pressure 1s applied to maintain the nut 11 in position on the screw bolt 10 to guarantee against loosening of the screw.

In the construction shown by way of vexample in Figs. 5 and 6 a spring rod 18 serving as a tensioning means has three adj acent bends in the same direction of which two 19 65 have a more pronounced bend at the ends of the spring than the middle part of the spring rod lying under the clamping plate.

In the form of construction shown by way of example in Figs. 7 to 9 the bends 21 of the projecting spring ends are in the opposite direction to that of the relatively iiatter bend 20 of the part of the spring lying under the clamping plate A7. This construction has the advantage that even after attaining the half tensioned position shown in Fig. 8 between the bearing point of the spring on the clamp,- ing plate 7 and the base 8 of the rails 'four different spring arms are eective which offer a very great tensioning resistance to the perti)ghtening of the clamping plate The clamping plate 7 is provided on its lower side turned towards the base of the rail with two bars 12 running 'in the direction of the rails which when in the tensioned position project in closev proximity to the base 8 of the rail, so that everi when the tensioning means 16 is broken the rail 1s not considerably loosened as the bars 12 act as stops for the longitudinal sides of the spring and prevent the tensioning means from springing out laterally.

The' invention is of course not limited to the forms of construction of the resilient tensioning means and the form of clamping plate shown but can be applied to many other uses while maintaining the same inventive thought.

What I claim is:

1. A rail fastening device comprising ir combination a base plate supported by the t1e, a clip fastened to the said base plate by means of a screw and resting upon a spring interposed between the free end of the cli; and the base flange of the rail, said spring being provided outward of the clip with pro longations bent to form additional springs.

2. rail fastening device comprising ir combmatlon a base plate supported by the tie a clip fastened to the said base plate by means of a screw and resting upon a spring interposed between the free end of the clip and th( base flange of the rail, said spring being provlded outward of the clip with prolongations bent 1n the same direction as the middle par1 of the spring and forming additiona springs.

3. rail fastening device comprising ir combinatlon a base plate supported by the tie a clip fastenedto the said base plate by means of a screw and resting upon a spring inter posed between the free end of the clip and th( base liange of the rail, said spring beingl provided outward of the clip with prolongation: bent 1n the opposite 'direction to the middle part of the spring and forming additionaf springs.

4. rail fastening device comprising i1: c ombmat1on a base plate supported by th tie, a clip fastened to the said base plate by means of a screw and provided at its inner end with' a shoulder or shoulders extending crosswise of the clip and a spring fitting between the shoulders of the clip and resting on the top face of the base flange of the rail, said spring being provided outward of the clip with prolongations bent to form additional springs. t

In testimony whereof, I have signed my name to this specification at Stuttgart, Germany, this l21st day of July, 1930.

KARL VOSSLOH. 

